Thanks for your question.
You are suffering from what is called as eosinophilic esophagitis
and eosinophilic gastritis
.The symptoms you have described are produced by this condition. Though intestinal parasites give rise to this condition, but exact cause of this condition is not known. It is a treatable condition and responds well to treatment. There is nothing to worry as this is neither malignant nor a pre malignant condition. Continue with the treatment prescribed to you by your gastroenterologist.
Hopefully you will get complete relief.
Hope this answers your question.